2 Jun
2005
2 Jun
'05
8:01 a.m.
Subject: need a source of 7501 micros
From: Chris M <chrism3667 at yahoo.com>
Date: Tue, 31 May 2005 19:16:31 -0700 (PDT)
To: cctech at classiccmp.org
....as used in the Commodore Plus 4. Preferably new
*lol*. Hey...you never know...
You'd be mighty lucky to get what you want.
The 7501 is a mask programmed 4bit micro with LCD driver
containing a 1024byte program rom and 96 nibbles of ram.
Where used it's a custom part due to the rom.
Know the part well as I used to be the product engineer.
Allison
2 Jun
2 Jun
8:39 a.m.
Am 2 Jun 2005 11:01 meinte Allison:
>Subject: need a source of 7501 micros
> From: Chris M <chrism3667 at yahoo.com>
> Date: Tue, 31 May 2005 19:16:31 -0700 (PDT)
> To: cctech at classiccmp.org
>....as used in the Commodore Plus 4. Preferably
new
>*lol*. Hey...you never know...
You'd be mighty lucky to get what you want.
The 7501 is a mask programmed 4bit micro with LCD
driver
containing a 1024byte program rom and 96 nibbles of ram.
Where used it's a custom part due to the rom.
Know the part well as I used to be the product
engineer.
Well, seams to be a close miss :)
The 7501 is a Commodore 6502 or to be more exact, its
the HMOS version of the NMOS 6510 as used in the C64,
which is a rather plain 6502 with one 7 bit paralell
port on chip. Later on the 8501 was done as a result
of another process change, eventualy leading to the
8502 as used in the C128.
So, if you search for a 7501 replacement, any 6510
might do it ... with some additional soldering, since
Commodore shifted the pins arround with every version.
Gruss
H.
--
VCF Europa 6.0 am 30.April und 01.Mai 2005 in Muenchen
http://www.vcfe.org/
8 Jun
8 Jun
11:12 p.m.
So has anyone tried substituting a 6510 for a 7501?
--- Hans Franke <Hans.Franke at siemens.com> wrote:
Am 2 Jun 2005 11:01 meinte Allison:
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>Subject: need a source of 7501 micros
> From: Chris M <chrism3667 at yahoo.com>
> Date: Tue, 31 May 2005 19:16:31 -0700 (PDT)
> To: cctech at classiccmp.org
>....as used in the Commodore Plus 4.
Preferably
new
>*lol*. Hey...you never know...
You'd be mighty lucky to get what you want.
The 7501 is a mask programmed 4bit micro with LCD
driver
containing a 1024byte program rom and 96 nibbles
of ram.
Where used it's a custom part due to the rom.
Know the part well as I used to be the product
engineer.
Well, seams to be a close miss :)
The 7501 is a Commodore 6502 or to be more exact,
its
the HMOS version of the NMOS 6510 as used in the
C64,
which is a rather plain 6502 with one 7 bit paralell
port on chip. Later on the 8501 was done as a result
of another process change, eventualy leading to the
8502 as used in the C128.
So, if you search for a 7501 replacement, any 6510
might do it ... with some additional soldering,
since
Commodore shifted the pins arround with every
version.
Gruss
H.
--
VCF Europa 6.0 am 30.April und 01.Mai 2005 in
Muenchen
http://www.vcfe.org/
14 Jun
14 Jun
8:32 a.m.
So has anyone tried substituting a 6510 for a 7501?
They are not drop-in compatible, but theoretically they can be converted (the
7501 has additional I/O lines for the Plus/4's more complex memory banking
strategy). The cbm-hackers or plus4 mailing lists might know more about this.
However, the 7501 is *not* exactly the same as a 6510 -- only close.
Hans is correct in that the later 8501 *is* drop-in compatible.
--
---------------------------------- personal: http://www.armory.com/~spectre/ --
Cameron Kaiser, Floodgap Systems Ltd * So. Calif., USA * ckaiser at floodgap.com
-- To err is human -- to forgive is not company policy. -----------------------
7083
days inactive
7095
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3 comments
4 participants
participants (4)
-
ajp166＠bellatlantic.net -
chrism3667＠yahoo.com -
Hans.Franke＠siemens.com -
spectre＠floodgap.com